Nature's Shield - May promotes a healthy immune system, whether indoors or outdoors. Neem leaf is known for its pesticide and insecticidal properties. Quassia bark deters mosquitoes and their larvae and is used to combat malaria. Garlic may help with natural flea, tick, and mosquito deterrents, and the Spirulina may help soothe bug bites. We recommend this supplement to your dogs in low-risk to high-risk months. For full-grown dogs, we recommend you dose for seven days a month. For puppies, the recommendation is ten days as they have a higher metabolism. May help with the prevention of fleas, ticks & mosquitos, itchy skin relief & healthy immune system. Veterinary health Product: NN.F1V2